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3.
Piping/Connections
ALL components/materials must conform to National Gas Code Specifications, or in CANADA, the
Canadian Installation Codes (for General Installation and Plumbing). It is important that gas pressure
regulators meet applicable pressure requirements and that gas meters be rated for the total amount of
ALL
the appliance BTUs being supplied.
The dryer is provided with a 1-1/4” N.P.T. inlet pipe connection extending out the back area of the burner
box. The minimum pipe size (supply line) to the dryer is 1-1/4” N.P.T. For ease in servicing, the gas supply
line of each dryer must have its own shutoff valve.
The size of the main gas supply line (header) will vary depending on the distance this line travels from the
gas meter or, in the case of liquid propane (L.P.) gas, the supply tank, other gas-operated appliances on the
same line, etc. Specific information regarding supply line size should be determined by the gas supplier.
NOTE: Undersized gas supply piping can create a low or inconsistent pressure, which will result in
erratic operation of the burner ignition system.
Consistent gas pressure is essential at ALL gas connections. It is recommended that a 1-1/4” pipe gas loop
be installed in the supply line servicing a bank of dryers. An in-line pressure regulator must be installed in
the gas supply line (header) if the (natural) gas pressure exceeds 12.0 inches of water column (W.C.) - 29.9
mb - pressure.
NOTE: A water column (W.C.) test pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches
(26.1 mb) for L.P. dryers is required at the gas valve pressure tap of each dryer for proper
and safe operation.
An 1/8” N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas supply
line immediately upstream of each dryer.
IMPORTANT: Pipe joint compounds that resist the action of natural gas and L.P. gas must be used.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
ALL components/materials must conform to National Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in Canada, the Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural Gas) or
CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION.